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      Question

      A, B and C can do a piece of work in 20 days, 30 days

      and 60 days respectively. If A works daily and on every third day B and C also work with A, then in how many days, will the work be completed?
      A 21 Correct Answer Incorrect Answer
      B 18 Correct Answer Incorrect Answer
      C 12 Correct Answer Incorrect Answer
      D 15 Correct Answer Incorrect Answer

      Solution

      1st day work by A = 3unit 2nd day work by A = 3unit 3rd day work by A+B+C=3+2+1 = 6unit Work done in 3 days is 3+3+6 = 12 unit Total time required to complete the work 3 x 5 = 12 × 5  15 days = 60unit In 15 days, the work will be completed.

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